The 50-200mm F2.8 Is Pro is the world's only fully weathersealed, all-purpose super-telephoto zoom lens, providing a 100-400mm equivalent focal length with a constant F2.8 aperture, weighing only 1,075 grams (2.37 pounds).Push your focal limitsAnimals in their natural environments, wildlife portraits, compressed landscapes, and intricate details of nature - all made possible with a 4x zoom range that covers super-telephoto and telemacro. Speed you can count onThe world's first 100-400mm (35mm equivalent) zoom lens with a constant F2.8 aperture lets you photograph with faster shutter speeds and perform reliably in low-light conditions.Extend your reachExtend your vision even further. The M.Zuiko Mc-teleconverters expand your reach up to 560mm F4.0 (Mc-14) or 800mm F5.6 (Mc-20) equalivant focal length.Adventure ready sizeDesigned with mobility in mind. Weighing just 1,075g (2.37lbs) and 1,250g (2.76lbs with tripod collar). Easy to carry, effortless to create.